Pannel connector

A flange 16 protrudes from side faces of a housing 10 of a connector attached to a panel, a waterproofing ring 18 being provided next to the flange 16. The positioning of terminals 14 passing through the housing 10 is regulated by an alignment plate 15. One end of the alignment plate 15 faces protrusions 19 on the waterproofing ring 18 from the side opposite the flange 16, thereby preventing the separation of the waterproofing ring 18 from the flange 16. According to this invention, the alignment plate 15 for correcting the positioning of the terminals 14 is used to prevent the separation of the waterproofing ring 18 without incurring high production costs, and as a consequence the connector can easily be attached to the panel.